Sinker



July 26, 1932. L, `DOCKMAN 1,8699305 SIINKER Filed eA"Dec: 15, 1930 5022115 ,EMA/Mrz Patented July 2e, 1932 t 1,869,305

UNITED (STATES l flAfi`ENrv oFFicE, j, g

LOUIS ALOYSIUSDOCKMAN, OFBAVLTIMOR, litri-12R.YLAND SNKERl j i Application led December 15, 1930. Serial No. 502,586.

This invention relates particularly to sinkof sufficient strength to satisfy the require! ers for fishing lines, although it is `adaptaments of use," 1 A ble to the construction of weights of lany type The" other type 1 ofsinker is of slender where it may be advantageous to havea' stream line shape'having twoeyes, one latstrong but slender eye at the ends of t-he each endof the sinker, and designed torbe Weight, f intercalated, inl the fish line intermediate the One of the objects of the invention is to endsthereof, either by having a bight off Vprovide a sinker of the type exemplified by the line pass lengthwise of thev sinker'and that disclosed in the patent to Chester N o. within the eyes, or by having the` line sev-i m 1,063,409, granted July 29, l9l3,.in which ered, withthesinkertiedin betweenithe sev` y y the inserted wire eye at each end is substiered ends. In either of these instances,-the tuted by an eye integrally cast under pressinker bears either the whole or aproporsure. tion of the stress imposed upon it by the pull Y l Other objects of the yinventionV will ap- 0r jerk ofthe fish and:consequently, thefeyes.y i pear as the following description of a pre'- must have sufficient tensile strength to withferred and practical vembodiment thereof stand this pull or jerk without breaking proceeds. away. Y v

In the drawing' in which the same charac- VIt is impossible to make the eyes massive. ters of reference have been used throughout and to-rely upon the-mere massiveness as an U the several figures to designate identical element oi' strength, for the stream line ltype fir parts: of?l sinker is particularly designed to enter Figures l, 2 and 3 are respectively, a side anddescend 'through the water without agielevation, an end elevation, and a longituditation of the water Which might scare off the, v nal cross section through a sinker made acfish and this construction negatives the prac-l ,d cording to the principles of the invention; ticability of providinginassive eyes at the' 75 Figure 4i is a hypothetical representation ends ofthe sinker. v` of a die by means of which the method of i On the other hand, it has heretofore never constructing the improved sinker may be been successfully accomplished to-castfasink# carried out; and er ofl this type with nonfinassive eyesatthe in.. Figures 5 and 6 are views in elevation, ends forthe reason that the cross sectionof so showing respectively, a sinker embodying the metal forming the rims of thev eyes is so the present invention contrasted with one small that the metal cools or granulates, which is old. v forming an'eye, the rim of' which is rough, Before adverting to a detailed description no'n-hoi'nogeneous"and weak so that itis apt of the several figures, it may be stated that not only to chaf'e' the line, but'also to breakv 85,' sinkers are in general, of two types, the away under the stress imposedby the jerk bank sinker such as is shown in Figure 6, when catching fish. f y 1 which comprises a massive bulb-shaped In Vorder'to illustrate the reality and seriweight having an eye cast in the upper end. oneness' of this problem, the bestsolution up w This type of sinker is designed to be atto the present time is found in the sinker disl 9U tached to the extremity of the fish line, and closed in the patent to Chester' hereinbefore is never subjected to any stress greater than referred to in which the eyes' are. separately. the weight of the sinker itself or ,the force formed of'wire loops, inserted in the body at r with which it may be thrown, as in casting. the time 01"'. casting the latter. '1l`hissinker` er: In consequence, no thought has been neces: has been luniversally adopted as the standard i? sary in the construction of the eye with a of its type. Y view to providing sufiicient tensile strength, The present invention as stated' in the foreand furthermore, the sinker being massive, going objeetsfcontemplates producing a sinkand the rim of the eye being massive, any er similar in s vape to that of Chester, byfs'ub- 5U process of casting produces an eye structure stituting for thefs'eparately insertedwire eyes,

eyes integrally cast with th-e body of the sinker.

Referring now in detail to the several figures,rthe numeral l represents. the body which in general may be said to have a shape generated by the revolution of a Ylenticular section aboutrits aXis. krlhe body is provided with eye extensions?, at the opposite ends and the convergentshapeof ythe body defines necks between the body and the eye eXtensions. Y n order to preserv the streamline advantages of the sinker, the eyes 2 are relatively small and the rims of said .eyes have a cross section considerably smaller than the necks between the eye extensions and body.

The sinker including the eye extensions is cast integrally under pressure in av manner hypothetically shown in Figure l in which the numerals 3 land e represent matchingdie part-s, defining the space 5 having the shape of the sinker and being trans-sected` adj acent Vthe ends by pins 6, which pins dene the annular channel to be filled by the molten ma'- terial ,which forms the eyes of the sinker.

The arrow? directed toward the sprue 8 indicates that the casting is done under pressure, and this is the essential step which imparts practicability and patentable novelty to the sinker.

YWere it not that the molten material is ap l plied under pressure, it would not run easily kce and uniformly around the eye channel, but on the contrary,-it would cool prematurely, forming a rough, non-homogeneous and more or less granular loop which would have the drawbacks referred to earlier in thespeciication, By applying pressure to the molten metal within the die, it uniformly fills every interstice, displacing all the air which escapes Vthrough the joint between the die parts, and n the metal quickly.` and before cooling fills the eye channels with a smooth, dense and homogeneousmass, forming a smooth and strong loop, equal in all respects to the inserted wirey loops shown in the construction of which Lthe y Chester patent is typical.

By contrasting the sinker ofthe present invention as shown in Figure 5, with the known bank sinker, shown in Figure 6,

both of .which sinkers have integrally cast y eyes, it` will be evident that the sinker of the present inventionbeing double eyed, is designed to be subjected to tensilerstresse'swhich may rise to a great force, depending upon the pull of the fish or the intensity of the jerk imparted to the line by the fisherman.- On the other hand, the bank sinker, having an eye at one end only is designed to dependv fromthe end of the line where itwill not be in the'line of transmitted force between the fish and Vfisherman. lttherefore, is required to-bear at themost, a comparatively smallv stress.

of the bank` sinker to give slenderness or deliforming the e made sufficiently masby Ordinar bvious therefore,

ciples of the present and patentable ad-y bank .sinker and he construction of the manufacture it a stream line sha cacy of construction rim of the eye may b sive to resist bre the material sinker following the prin Vinvention exhibits ne vantages over the old not suggested by bank sinker.

While I have in the closed my invention in r itis obvious that ved for thev cons ture having eyes at ally cast where th delicate and tical of production by or longated body conhe ends. and having eye eX- said body and eye eX- lly cast underv pressure and homogeneity and le strength of the eye Sinker compri vergent towai tensions at both ends,

. tensions being integra whereby the density consequently, the tensi rims isenhanced.

` ln testimony lLOUIS A fiX my signature.'

LOYSIUS DOCKMAN. Y

whereof l a "Furthermore, since there is fno .attempt in l 15eY 

